Reynolds stress modeling of vegetated open-channel flows

Sung Uk Choi, Hyeongsik Kang

Research output: Contribution to journalArticlepeer-review

96 Citations (Scopus)


The Reynolds stress model is applied to open-channel flows with vegetation. For the computation of pressure-strain term, the Speziale, Sarkar, and Gatski's model is employed. Mellor and Herring's model and Rotta's model are used for diffusion and dissipation rate of Reynolds stress, respectively. Flow structures of open-channels under two vegetative conditions are simulated, namely submerged and emergent plants. Plain open-channel flows are also simulated for comparisons. Computed profiles are compared with the results from the k-ε model and the algebraic stress model as well as measured data available in the literature. For the plain open-channel flow and the open-channel flow with emergent vegetation, the Reynolds stress model is observed to simulate the non-isotropic nature of the flows better than the algebraic stress model and the k-ε model. For the open-channel flow with submerged vegetation, it is found that the Reynolds stress model predicts the mean flow and turbulence quantities best compared with the other models. Sediment transport capacity of vegetated open-channel flows is also investigated by using the computed profiles. It is shown that the isotropic turbulence model underestimates the suspended load seriously.

Original languageEnglish
Pages (from-to)3-11
Number of pages9
JournalJournal of Hydraulic Research
Issue number1
Publication statusPublished - 2004

Bibliographical note

Funding Information:
This study was supported by grants from the Brain Korea 21 Project sponsored by the Ministry of Education in Korea. The writers would also like to thank Professor Heidi M. Nepf, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, for providing the experimental data.

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Water Science and Technology


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